Twist valve for a medical bag



FIG. 1 is a perspective view of a twist valve for a medical bag, showing in dotted lines, the medical bag;

FIG. 2 is a front side elevational view thereof, shown at an enlarged scale, all sides being identical thereto;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a bottom plan view thereof.

The dotted lines showing of a medical bag is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a twist valve for a medical bag, as shown and described. 